Added details of date format configuration.

Author: AndyButland

13/umbraco-forms/developer/configuration/README.md

@@ -110,7 +110,9 @@ For illustration purposes, the following structure represents the full set of op
     },
     "FieldTypes": {
       "DatePicker": {
-        "DatePickerYearRange": 10
+        "DatePickerYearRange": 10,
+        "DatePickerFormat": "LL",
+        "DatePickerFormatForValidation": ""
       },
       "Recaptcha2": {
         "PublicKey": "",
@@ -518,6 +520,14 @@ For more information, see the [Headless/AJAX Forms](../ajaxforms.md) article.
 
 This setting is used to configure the Date Picker form field range of years that is available in the date picker. By default this is a small range of 10 years.
 
+#### DatePickerFormat
+
+A custom date format can be provided in [momentjs format](https://momentjscom.readthedocs.io/en/latest/moment/01-parsing/03-string-format/) if you want to override the default.
+
+#### DatePickerFormatForValidation
+
+If a custom date format is provided it will be used on the client-side. A matching string in [C# date format](https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings) should be provided, in order that server-side validation will match the expected format of the entry.
+
 ### reCAPTCHA v2 field type configuration
 
 #### PublicKey & PrivateKey

13/umbraco-forms/release-notes.md

@@ -27,6 +27,8 @@ These can be options are enabled and configured on a per-form basis by editors i
 
 Forms ships it's themes and email templates as part of a razor class library for ease of distribution. With this release we make that feature [available to your own custom themes and templates](./developer/themes.md#shipping-themes-in-a-razor-class-library) (or those created by package developers) [#795](https://github.com/umbraco/Umbraco.Forms.Issues/issues/795).
 
+The format for the date field can now be provided in configuration [#1276](https://github.com/umbraco/Umbraco.Forms.Issues/issues/1276).
+
 To allow finer control over editor permissions, we've introduced a "delete entries" setting available on users and user groups. Thus you can now give editors explicit permissions to view, edit or delete entries [#1303](https://github.com/umbraco/Umbraco.Forms.Issues/issues/1303).
 
 Other bug fixes included in the release:

14/umbraco-forms/developer/configuration/README.md

@@ -110,7 +110,9 @@ For illustration purposes, the following structure represents the full set of op
     },
     "FieldTypes": {
       "DatePicker": {
-        "DatePickerYearRange": 10
+        "DatePickerYearRange": 10,
+        "DatePickerFormat": "LL",
+        "DatePickerFormatForValidation": ""
       },
       "Recaptcha2": {
         "PublicKey": "",
@@ -515,6 +517,14 @@ For more information, see the [Headless/AJAX Forms](../ajaxforms.md) article.
 
 This setting is used to configure the Date Picker form field range of years that is available in the date picker. By default this is a small range of 10 years.
 
+#### DatePickerFormat
+
+A custom date format can be provided in [momentjs format](https://momentjscom.readthedocs.io/en/latest/moment/01-parsing/03-string-format/) if you want to override the default.
+
+#### DatePickerFormatForValidation
+
+If a custom date format is provided it will be used on the client-side. A matching string in [C# date format](https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings) should be provided, in order that server-side validation will match the expected format of the entry.
+
 ### reCAPTCHA v2 field type configuration
 
 #### PublicKey & PrivateKey

14/umbraco-forms/release-notes.md

@@ -32,6 +32,8 @@ A second "form details picker" is also available, allowing editors the option of
 
 Forms ships it's themes and email templates as part of a razor class library for ease of distribution. With this release we make that feature [available to your own custom themes and templates](./developer/themes.md#shipping-themes-in-a-razor-class-library) (or those created by package developers) [#795](https://github.com/umbraco/Umbraco.Forms.Issues/issues/795).
 
+The format for the date field can now be provided in configuration [#1276](https://github.com/umbraco/Umbraco.Forms.Issues/issues/1276).
+
 To allow finer control over editor permissions, we've introduced a "delete entries" setting available on users and user groups. Thus you can now give editors explicit permissions to view, edit or delete entries [#1303](https://github.com/umbraco/Umbraco.Forms.Issues/issues/1303).
 
 Finally thanks to a kind contribution from [Erik-Jan Westendorp](https://github.com/erikjanwestendorp) the backoffice is now translated into Dutch [#1264](https://github.com/umbraco/Umbraco.Forms.Issues/issues/1264).

15/umbraco-forms/developer/configuration/README.md

@@ -110,7 +110,9 @@ For illustration purposes, the following structure represents the full set of op
     },
     "FieldTypes": {
       "DatePicker": {
-        "DatePickerYearRange": 10
+        "DatePickerYearRange": 10,
+        "DatePickerFormat": "LL",
+        "DatePickerFormatForValidation": ""
       },
       "Recaptcha2": {
         "PublicKey": "",
@@ -513,6 +515,14 @@ For more information, see the [Headless/AJAX Forms](../ajaxforms.md) article.
 
 This setting is used to configure the Date Picker form field range of years that is available in the date picker. By default this is a small range of 10 years.
 
+#### DatePickerFormat
+
+A custom date format can be provided in [momentjs format](https://momentjscom.readthedocs.io/en/latest/moment/01-parsing/03-string-format/) if you want to override the default.
+
+#### DatePickerFormatForValidation
+
+If a custom date format is provided it will be used on the client-side. A matching string in [C# date format](https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings) should be provided, in order that server-side validation will match the expected format of the entry.
+
 ### reCAPTCHA v2 field type configuration
 
 #### PublicKey & PrivateKey